Interconnecting layers of different crystalline silicon bottom cells in monolithic perovskite/silicon tandem solar cells

In the past five years, power conversion efficiency (PCE) of monolithic perovskite/silicon tandem solar cells is improved from 13.7% to 29.15%, demonstrating a massive growth. The electrical and optical properties of interconnecting layers (ICLs) play one of crucial roles in determining the performance of perovskite/crystalline silicon (c-Si) tandems. And the employment of ICLs is directly related with front passivation of bottom c-Si cells. Here, we reviewed the respective development progresses of ICLs for different c-Si bottom cells in monolithic perovskite/c-Si tandem solar cells. Then we present key strategies to realize a good electrical connection and light management. Finally, optimized ICLs were designed to enhance PCE of tandems based on the balance between optical and electrical aspects for different c-Si bottom cells, which will shed light on ICLs of perovskite/silicon tandems.